Practice-management API depth, Cornerstone, AVImark, ezyVet, Provet Cloud, IDEXX?

The #1 moat in B2B vet supply. Once you’re wired into a clinic’s practice-management system (PIMS) for one-click reorder, switching costs spike. Different integration depths per PIMS:

• Cornerstone (IDEXX), ~60% market share in US vet clinics. Closed API, but supports CSV/XML import via the “Cornerstone Foundation” data exchange. Integration is one-directional (Magento → Cornerstone for SKU master + price; Cornerstone → Magento for reorder via a clinic-side button). Cleanest path: ship a Cornerstone plugin that surfaces a “Reorder from [your distributor]” button inside the inventory module.
• AVImark (Henry Schein), ~25% US market share. Better-documented export, integration via the “AVImark Integration Specification.” Supports two-way price + inventory sync.
• ezyVet, international cloud-native, growing fast (especially AU/NZ/UK). Clean REST API with OAuth2. Easiest of the five to integrate. Webhooks for inventory threshold alerts → auto-reorder.
• Provet Cloud, European cloud-native PIMS. Webhooks + REST API. Smaller install base than the others but the integration is the cleanest.
• IDEXX Cornerstone (cloud version), newer cloud product, REST API in beta. Worth watching but install base still small.

Magento integration architecture: customer’s PIMS surfaces a “reorder this Heartgard 6-pack” button with patient name + DVM signature prefilled. Button hits a Magento REST endpoint that creates an order in the customer’s account, runs DEA/Rx validation if applicable, and routes to the cheapest distributor. Cuts order-entry friction 90% vs phone/fax.

Start with one PIMS connector (usually Cornerstone or AVImark by clinic share). Add more as your clinic customers ask.